They are not dangerous. Especially never grind such damage because these degradations are located on the surface only. Some deeper size pittings may optionally be clipped (greater than 3 mm size).
Grinding reduces the contact patterns, increases the remaining Hertz pressure, accelerates the aging process and increases costs over time.
The pittings appear with the number of cycles, conditions of lubrication, and hardness. Their cycle goes through phases of stabilization and development. It does not affect the lifetime of the short-term part.